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Calibration of an acoustic echo-integration system in a deep tank, with system gain comparisons over standard sphere material, water temperature and time
dB on the TS of one sphere. 3. EQUIPMENT AND PROCEDURES An extensive calibration was performed on ... tank is a cylindrical steel structure, approximately 10 m deep by 3 m in diameter. It was filled with ... ): Bandwidth (kHz): Transmit power (kW): Angle Sens. (deg.): 2-Way Beam Angle (deg.): 3-dB Beamwidth (deg ... ) 17.0 -18.5 9.0 3 50 5.5, 5.0, 3.5, 3.0, 1.0,0.5 34.0 (±0.5) A wide receiver bandwidth was used ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 127–144 : Autor(es): Demer, D.A. and R.P. Hewitt
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Small scale krill surveys: simulations based on observed euphausiid distributions
be described as having a radius of 50 to 100 km (27 to 50 n miles) (SC-CAMLR-IX, Annex 4, Table 3 ... different positions with regard to the swarms. 247 3. RESULTS The results of 10 000 transects on ... , converged on the known mean (Table 1). Figure 3 shows that there was a relationship between the means and ... 3(b) are very high, but are similar to those obtained by Higginbottom et al. (1988) from 1 n mile ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 245–256 : Autor(es): Agnew, D.J. and S. Nicol
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Homogeneity of body length composition of Antarctic krill within the commercial zone
adjacent classes to increases DU to 5 or larger. 3 . RESULTS AND DISCUSSION Results for each haul are ... areas where length compositions were bimodal. As shown in Figure 3, in areas where the overall length ... compositions. Data Set Type of Length Number of DF X2 p Set Composition Samples -1- -2- -3- -4- -5- -6- 1 ... b 3 26 13.091 0.9831 2 m 3 12 26.091 0.0104* 3 m 2 12 16.767 0.1586 4 b 2 18 15.523 0.6258 5 b 2 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 17–28 : Autor(es): Ichii, T.
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Acoustic data analysis and models of krill spatial distribution
those for krill distributions. The spectral slope of -1.66 is quite consistent with the -5/3 power ... estimated average krill biomass (g/m3; 200 k kHz estimates) at each meter of depth ranging from 3 to 185 m ... spanning the same scales as Weber et al (Figures 2 and 3). 314 A second description of spatial ... same data set (Figure 5). 3. RESULTS The resulting spectra shown in Figures 2 and 3 are roughly ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 311–329 : Autor(es): Morin, A., A. Okubo and K. Kawasaki
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Distribution of fish larvae at South Georgia: horizontal, vertical, and temporal distribution and early life history relevant to monitoring year-class strength and recruitment
, so their vertical distribution is included later under part 3. (Figure 19). Chamsocephalus ... depths fished on a single station near to the coast (Figure 3). They were abundant one month later in ... shelf at South Georgia, and rare or absent in oceanic waters beyond the shelf. 3. DIURNAL VERTICAL ... during six periods of the day (Figure 26). The Foredeck Net was fished as described in part 3, with six ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/4 (Selected Scientific Papers, SC-CAMLR-SSP/4) : 105-141 : Autor(es): North, A.W.
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Patterns and processes in the distribution and dynamics of Antarctic krill
food availability? 3. What is the interaction between spatial patterns and fishing behavior? 4. How ... , grazing will be allowed to modify the basic distribution. 3. PRELIMINARY DATA ANALYSIS OF KRILL SPATIAL ... Denman, 1980); these slopes were close to the -5/3 prediction of Kolmogorov (1941) for the inertial ... way. The data tapes contained continuous reading of estimated average krill biomass (g m-3 ; 200 kHz ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 281–299 : Autor(es): Levin, S.A., A. Morin and T.M. Powell
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Review of length-weight relationships for Antarctic krill
Tables 3 and 4 contain wet weight data. In most cases krill were separated according to sex. In their ... both dry weight (Table 2) and wet weight (Table 3). Morris et al. (1988) noted that 'surprisingly ... relationships for males, gravid females and non-gravid females (Table 3); (b) during the post-spawning period ... females (Table 3); (c) during the winter and pre-spawning periods use general length-weight ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/9 (Selected Scientific Papers, SC-CAMLR-SSP/9) : 145–155 : Autor(es): Siegel, V.
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Choosing distance between acoustic survey tacks
. * * * * * * * * * * BbIEOP PACCT05IHM5I MIDK.lI:Y fAJICAMM nPM AKYCTMQECKOl1 C1EMKE M.n.KanHXMaH, 3.M. KH3Hep, E.P ... . Mathematically, it can be strictly proved that the typical size is determined by the relationship 1 (3) In ... error 8= vr302_202~20%=0.2. Assuming k=l, we use expression (3) to find a typical size 1= ~=100 miles ... density. Variation coefficient values b - 3.2. a - 3.1; " f-' 0\ f-' r/l 0,5 0,4 0 0 3 ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 153-164 : Autor(es): Kalikhman, I.L., Z.I. Kizner, B.R. Zaripov and W.D. Tesler
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Measurements of differences in the target strength of Antarctic krill (Euphausia superba) swarms at 38 kHz and 120 kHz
region. 3. RESULTS Krill in both areas were generally found in discrete swarms which were clearly ... between them (L\ MSBS) are shown for both sets of intervals in Table 2, and are plotted in Figure 3. The ... (Interval 470). It can be seen from Figure 3 that the MSBS values at the two frequencies track each other ... , which suggests a target strength some 3 dB higher at 120 kHz than at 50 kHz. Furthermore, the ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/7 (Selected Scientific Papers, SC-CAMLR-SSP/7) : 75–86 : Autor(es): Hampton, I.
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Detection and quantitative estimation of krill concentrations by hydroacoustic instruments
registration of the item, m ; f. transmission repetition frequency, imp/min. ~mp (3) - 132 - This ... echo signal from an individual krill. As an example, we have calculated by formula (3) directivity ... calucations is shown in Figure 3. As follows from the graph, the detection of krill at shallow depths ... . References (Russian) 1. Samovolkin V.G. 2. Yudanov K.I. 3. Stashkevich A.P. 4. Protaschuk V.A ...
Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 123-139 : Autor(es): Yudanov, K.I.